Synthesis of 3-substituted quinolines via transition-metal-catalyzed reductive cyclization of o-nitro Baylis-Hillman acetates

Synthesis of multisubstituted quinolines from Baylis–Hillman adducts obtained from substituted 2-chloronicotinaldehydes and their antimicrobial activity

Baylis-Hillman acetates were synthesized from substituted 2-chloronicotinaldehydes and were conveniently transformed into multisubstituted quinolines and cyclopenta[g]quinolines on reaction with nitroethane or ethyl cyanoacetate via a successive S(N)2'-S(N)Ar elimination strategy. Thus, synthesized quinolines were evaluated for antimicrobial activity and found having substantial antibacterial and antifungal activity.

The Baylis–Hillman approach to quinoline derivatives

Baylis-Hillman reactions of 2-nitrobenzaldehydes with various activated alkenes afford adducts that undergo reductive cyclisation to quinoline derivatives. The chemo- and regioselectivity of cyclisation appears to be influenced by the choice of both the substrate and the reagent system, and competing reactions have been observed.

Synthesis of Substituted Quinolines by Electrophilic Cyclization of N-(2-Alkynyl)anilines

Quinolines substituted in the 3-position by an iodo or phenylseleno group are readily prepared in good to excellent yields by the reaction of propargylic anilines with appropriate electrophiles under mild reaction conditions. [reaction: see text]

A general method for making bicyclic compounds with nitrogen at a bridgehead—application to the halichlorine spiro subunit

N-protected beta-amino aldehydes having the nitrogen in a ring are easily converted into Morita-Baylis-Hillman adducts; O-acetylation and N-deprotection result in spontaneous cyclization to bicyclic structures having nitrogen at a bridgehead.

Simple, Facile, and One-Pot Conversion of the Baylis−Hillman Adducts into Functionalized 1,2,3,4-Tetrahydroacridines and Cyclopenta[b]quinolines

A simple, facile, and one-pot synthesis of functionalized 1,2,3,4-tetrahydroacridines and cyclopenta[b]quinolines from the Baylis-Hillman alcohols, i.e., 2-[hydroxy(2-nitroaryl)methyl]cycloalk-2-enones, is described.